Embroidering-machine.



R. ZAHN.

EMBROIDERING MACHINE.

APPLICATION FILED DEO.9,1912.

1,118,612, Patented Nov. 24, 1914.

STAS rnrrnnrr OFFICE.

ROBERT Z A HN, 0F PLAUEN, GERMAN Y; ALFRED RIETZSGH ADMINISTRATOR OF SAID ZAHN, DECEASED.

EMBROIDERING-MACHINEQ Specification of Letters Patent.

Patented Nov, 24,1914.

Application filed December 9,1912. Serial No. 735,714. r l

T all whom it may concern Be it known that 1, ROBERT ZAHN, a subject of the German Emperor, residing at llauen, in Vogtland, in the Kingdom. of Saxony, Germany, have invented certain new and useful Improvements in Embroidering-Machines, of which the following is a specification.

With embroidering machines, the operation of the needles, shuttles, thread tension levers and other embroidering implements is effected in well known manner from cams driving rocking levers through the medium of rollers carried by the latter. Some of these operating mechanisms, in particular,

. those for the needles and shuttles, have to their purpose.

move such heavy masses, that with the extraordinary long embroidering machines, which now have come into exclusive use, the motion transmitting devices hitherto employed become unfitand no more answer Various methods have been tried to improve the same. Thus for instance, the bearing surfaces of the roller spindles or pins have been increased proportionately to the increased bearing pressure. Such increase could only be effected by lengthening the roller spindle or pin or by increasing the diameter thereof, or by both. The increase of the diameter of the roller spindle or pin, however, is only possible within narrow limits because the excessive increase of the roller spindle diameter would hinder the rotation of the roller. The lengthening of the roller spindle or pin on the other hand, renders the driving mechanism not only clumsy, and uncomely, but also much space is taken up by the long roller bearings so that the already very restricted space for the operator to Work in, is still more decreased. It is well known that, during the operation of the machine the operator stands in front of the pattern board near the driving part of the machine, holding in his left hand the pantograph pin and controlling with his right hand and with one foot the diverse levers of the driving mechanism. If it is considered that from time to time he must bend over in order to examine the work, it will be clear that such further reduction of the space in which the operator moves, would hinder his properly attending the work and result in defective goods, and may even render the work impossible.

The:present invention has for its object to improve the driving mechanism above referred to, so as to render the same fit to take up the high pressure exerted onthe bearings of the roller spindles, in embroidering Ina chines of such immense sizes as now in use, and to attain that object without increasing the bearing surface of the. roller spindles or pins.

To accomplish my object, I make use of an expedient well known in mechanics, and 1 although I am well aware that such expedient has been used for similar purposes in different kinds 0t machinery, I am not aware that the same has been used in con.

same is more or less diagrammatically illus-.

trated in the accompanying drawing in which similar reference letters denote corresponding parts, and in whichliigure 1 shows a vertical section of an embroidering machine and Fig. 2 a cross section through one of the cam engaging rollers.

In the present embodiment of the invention, the driving mechanism for the needle bars, and shuttle guides is illustrated,

although my invention is not limited to the driving mechanism for these parts only.

With reference to the drawing, let 0, 0 denote the cams fixed to the main driving shaft 0 and let (Z, (Z denote the bell crank levers or the like, whereby movement is imparted from those cams to the needlebars e and shuttle guides 7 respectively. The bell crank levers in well known manner are operated from the cams through the medium of the rollers 6 carried by the free ends of the bell crank levers.

As it was stated in the outset of this specification, the bellcrank levers particularly those which transmit motion to the needle bars and shuttle guides, have to move heavy masses, for which the hitherto used 0011-, struction of the roller bearings has been found unfit. To improve the construction, the rollers carried by the bell crank levers d, d are provided with ball bearings which consists of annular socket members m arranged between the spindles or pins a and the outer rim 7; of the rollers 79 and between which socket members balls at are mounted. Owing to this construction, the driving mechanism may remain as narrow or small as it was with the oldest and smallest types of shuttle embroidering machines which are 7 operated with very low speed.

It is, of course, immaterial, as to whether or not the diameter of the annular guide members are made smaller or larger than tion with embroidering implements, actuating cams and levers for operating said implements, of rollers for engaging said cams and comprising spindles or pins carried by said levers, outer rims, annular socket members between said rims and pins and balls mounted between said socket members, substantially as and for the purpose set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

ROBERT ZAHN.

Witnesses:

A. C. ROTH, ROBERT H. NIER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. i 

